Alka-Seltzer "Plop Plop Fizz Fizz"

1976

1969. Tom Dawes' jingle "Plop, plop, fizz, fizz, oh what a relief it is" for Alka-Seltzer. Quadrupled sales by doubling perceived dosage (two tablets per glass instead of one). The defining advertising trick of the late 1960s.